You might want to listen this https://darknetdiaries.com/episode/172/

I’ve been using it for more than a year to communicate with my family and a very small group of friends. The video and audio call features are good and I’ve replaced phone calls and Signal/WhatsApp with it. Because it’s XMPP, there are many clients you can use, not just the Snikket app. Overall, I recommend it because of the End2End Encryption features and self-hostable (if that’s a term)